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1. Tier 13 Sets

Tier 13 set pieces can only be traded for tokens that drop from
bosses in Dragon Soul. Every difficulty has its own item level,
384 for LFR, 397 for 10-man/25-man Normal, and 410 for 10-man/25-man
Heroic.

Pieces of different item levels can be combined in order to complete
a set and obtain the corresponding bonuses.

In LFR, it looks as if each boss has a chance to drop some tokens,
contrary to what the Encounter Journal says. Item level 397 Hands and
Legs pieces also have a chance to drop from
Alizabal in Baradin Hold.